JPH05161280A - Auxiliary power supply for vehicle - Google Patents

Abstract

PURPOSE:To efficiently use the power from an electromagnetic type retarder that is outputted during the braking operation of a vehicle as the power supply for charging a battery by using a capacitor having a large capacitance. CONSTITUTION:An output from a retarder 1 for regenerating the power during the braking operation of a vehicle is supplied to an electrical double-layer capacitor 5 through a rectifier 16 and a diode 52 is connected in such a direction that charge is led to a battery 3 from the capacitor 5. Therefore, the diode 52 is reversely biased under the normal condition and power supply from the battery 3 by self-discharge of the capacitor 5 is suspended, but when an engine is started, a relay B closes due to the operation of a key switch 6 and the capacitor 5 is charged by the battery 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary power supply device for a vehicle used for a delivery vehicle or the like, which has a small traveling distance and a large number of engine starts.

[0002]

2. Description of the Related Art The power source of a vehicle is composed of a generator driven by engine torque and a battery charged by the output of the generator. These capacities are consumed by a starter of the engine and other electric loads. It is usually set to be slightly higher than the amount of electric power used.

In the case of short-distance traveling delivery vehicles in the city, which are increasing in number in recent years, the number of times of starting is high when the delivery distance is about several tens of kilometers because the engine is stopped during delivery. As shown in the chart in Fig. 4, the number of starts is several times that of ordinary cars of the same class.

[0004]

In the delivery vehicle as described above, since the engine is started many times, the battery tends to be over-discharged and the service life is shortened. As a countermeasure against this, an increase in the output capacity of the generator can be considered, but in the present situation, in a 1 to 2 ton vehicle, the large capacity generator cannot be used due to the limited space in the engine room.

By the way, Japanese Patent Laid-Open No. 59-222041 discloses a battery charging device for a vehicle in which the retarder used during braking of the vehicle is of an electromagnetic type and is charged by its output, but the output from the retarder during braking is disclosed. Is intermittent in a short time, on the other hand, a battery that stores electric power by using a chemical reaction is charged by supplying a limited current for a long time, and it is not possible to use the power output from the retarder to charge the battery. There is a problem of inefficiency.

The present invention has been made in view of the above problems, and an object of the present invention is to store regenerative electric power from an electromagnetic retarder during braking in a capacitor having a large electrostatic capacity and use it for charging a battery. It is to provide an auxiliary power supply device for a vehicle.

[0007]

To achieve the above object, according to the present invention, there is provided an auxiliary power supply device for a vehicle, which comprises an electromagnetic retarder and uses a power generation output at the time of braking for charging an on-vehicle battery, There is provided an auxiliary power supply device for a vehicle, which has a large-capacitance capacitor charged by the output from the retarder and a charge control means for supplying the charge of the capacitor to a battery.

[0008]

In the present invention, the electric double layer capacitor having a large electrostatic capacity is provided, and the regenerative electric power from the electromagnetic retarder at the time of braking is introduced into the electric double layer capacitor to be charged, and the battery is charged by this electric charge. The electric double-layer capacitor can be used efficiently even if the electric power from the electric power source is short time, intermittent, or high power.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a structural block diagram showing an embodiment of a vehicle auxiliary power supply device according to the present invention, FIG. 2 is a partial sectional view showing an example of an electromagnetic retarder used in this embodiment, and FIG. 3 is a vehicle. It is explanatory drawing which shows arrangement | positioning of a retarder, a starter, etc.

In these drawings, reference numeral 1 denotes a retarder, which is attached to a drive shaft 11 from an engine to recover energy during braking of a vehicle into electric power, and a rotor core 12 coupled to the drive shaft 11, The armature 14 and the field magnet portion 15 arranged on the retarder cover 13 are provided.

Then, due to the induction of the magnetic flux of the core 152 generated by the energization of the coil 151 of the field portion 15, the adjacent magnetic poles 121 and 122 in the peripheral portion of the rotor core 12 are magnetized to have different polarities, and these magnetic poles are magnetized. Rotation of armature coil 1
An electromotive force is generated in 41 to generate AC power. Therefore, when the vehicle is braked, the braking force is applied by exciting the field portion 15 and applying a load such as supplying the power generation output from the armature 14 to a battery or the like.

Next, reference numeral 2 in FIG. 1 denotes a generator driven by engine torque, which supplies electric power to an electric load 4 such as charging of a battery 3 and auxiliary equipment, and 5 denotes an electric machine having a large electrostatic capacity. This is a double-layer capacitor, which uses dilute sulfuric acid as an electrolyte for a polarizable electrode made of, for example, activated carbon. Since the internal resistance is extremely low, a large amount of power can be transferred instantaneously. Therefore, power generation from the retarder 1 in a short time The output can be charged efficiently, and it is possible to cope with a sudden discharge of a large current to the starter at the time of engine start, and the capacity of the electric double layer capacitor 5 can be detected by its terminal voltage. A capacity indicator 51 is added. Reference numeral 52 shown in the figure is a diode formed of a semiconductor element, and is mounted so that current can flow from the electric double layer capacitor 5 to the battery 3.

Reference numeral 6 denotes a key switch operated by the driver, which can be opened / closed by both a rotating operation and a push operation, and the connection of each contact is constructed as shown in the diagram below in FIG. A relay A and a relay B are connected between the starter 7 for starting the engine and the starter 7 as shown in the figure, and the key switch 6 is used for starting the engine.
Is operated to the IG position, the capacity indicator 51 detects the capacity of the electric double layer capacitor 5, and if the capacity is equal to or larger than a predetermined value, the relay A is rotated to the next ST position.
Is closed and the starter 7 is energized to start the engine.

If the key switch 6 is pressed at the IG position when the capacity of the electric double layer capacitor has not reached the predetermined value, the B of the key switch 6 as indicated by the chain line in the above-mentioned diagram is displayed.
And S contact are connected, the relay B is closed, a current is passed from the battery 3 to the electric double layer capacitor 5, charging is performed, and the electric double layer capacitor 5 is started.

Next, the operation of the present embodiment thus constructed will be described.

When the field portion 15 of the retarder 1 is excited in order to reduce the vehicle speed while the vehicle is traveling, a plurality of magnetic poles in the peripheral portion of the rotor core 12 are alternately magnetized to have different polarities by the induction, and the corresponding armature is obtained. The magnetic flux is linked to 14 to give a braking force to the vehicle as an attractive force, and the braking energy is converted into electric power.

Then, the AC power from the armature coil 141 is converted into DC by the rectifier circuit 16 and guided to the electric double layer capacitor 5 to charge the capacitor.
At this time, even if the power generation output from the retarder 1 is short and the power is large, the power generation output is effectively charged due to the characteristics of the capacitor.

When the terminal voltage of the electric double layer capacitor 5 becomes higher than that of the battery 3 by such charging, the battery 3 is charged through the diode 52, and power is supplied to the vehicle-mounted electric load 4 by turning on the switch 41. Will be done.

To start the engine, the key switch 6 is operated to the IG position as described above, and the capacity indicator 5 is turned on.
When the capacity of the electric double layer capacitor 5 according to 1 is sufficient for starting the engine, the relay A energizes the starter 7 to start the engine when operated to the ST position. When the capacitance value detected from the capacitance indicator 51 is insufficient for starting by operating to the IG position, press the key switch 6 to S
When operated to the position to close the relay B and charge the electric double layer capacitor 5 with the battery 3, the terminal voltage of the electric double layer capacitor 5 becomes equal to the battery voltage, and the electric double layer capacitor 5 having a low internal resistance It will be prepared for starting.

Since the electric double layer capacitor 5 has a high self-discharge rate, it consumes electric power if it is constantly connected to the battery 3. Therefore, in this embodiment, a relay B is provided and both are turned off when the key switch 6 is in the IG position. It is an open space.

Although the present invention has been described with reference to the above embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0023]

According to the present invention as in the above embodiments,
First, the generated output of the electromagnetic retarder during braking is led to the electric double layer capacitor for charging, so it is unsuitable for charging the battery such as the output from the retarder for a short time, intermittent and instantaneously with a large current. The electric double layer capacitor can sufficiently cope with it and effectively charge it, and then the battery is charged by this charge, so that the recovered power at the time of braking is efficiently used for charging the battery.
Even in the case of a short-distance delivery vehicle with a large number of start-ups, it is possible to obtain an effect that over-discharge of the battery can be suppressed.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of an auxiliary power supply device for a vehicle according to the present invention.

FIG. 2 is a partial cross-sectional view showing an example of an electromagnetic retarder used in this embodiment.

FIG. 3 is an explanatory diagram showing an arrangement of a retarder, a starter and the like in a vehicle.

FIG. 4 is a table showing an example of a comparison of actual conditions between a short-distance delivery vehicle and a general vehicle.

[Explanation of symbols]

 1 ... Retarder 3 ... Battery 5 ... Electric double layer capacitor 6 ... Key switch 7 ... Starter

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical indication H02P 15/00 G 8325-5H

Claims (3)

[Claims] 1. An auxiliary power supply device for a vehicle, which comprises an electromagnetic retarder and uses a power generation output at the time of braking to charge an on-vehicle battery, and a large electrostatic capacity capacitor charged by the output from the retarder, An auxiliary power supply device for a vehicle, comprising: a charge control unit that supplies the charge of a capacitor to a battery. 2. The auxiliary power supply device for a vehicle according to claim 1, wherein said charge control means always disconnects said capacitor and battery and is connected by a key switch operated by a driver. 3. The auxiliary power supply device for a vehicle according to claim 1, wherein the capacitor is an electric double layer capacitor using an electric double layer principle.